Telephone call transmitter



1941- c. D. RICHARD 2,253,650

TELEPHONE CALL TRANSMITTER 9 Sheets-Sheet 1 Filed March 24, 1938 FIG? li dlxwi IN l/E N TOP c. 0. RICHARD 9. %(aa% [MM ATTORNEY C. D. RICHARD TELEPHONE CALL TRANSMITTER Aug. 26, 1941.

Filed March 24, 1938 9 Sheets-Sheet 2 CR /NVEN7 0P I 0. v0. RICHARD ATTORNEY 1941- v c. D. Rli-IARD 2,253,650

TELEPHONE CALL TRANSMITTER I k F-iled March 24,1938 9 Sheets-Shet 4 230 236 23/ 223 I23 60 73 Ila FIG. 7

F/aa l v I K3 1;

"Mama A TTOR/VE V c. D. RICHARD 2,253,650

TELEPHONE CALL TRANSMITTER Aug. 26, 1941.

Filed March- 24, 1938 e Sheets-Sheet 5 2 a 73 223 2 E I23 224 7 on 4 5 :1! 96 /00 X X Y 99 FIG. /0

' /N V? N T 0k 6. 0. RICHARD 4 T TORNE V 9 I c. D. RICHARD 3,650

TELEPHONE CALL TRANSMITTER Filed March 24, 1938 9 Sheets-Sheet 6 INVENTOR C. D. RICHARD AT TORNEV 6 1 c. 1:). RIICHARD 2,253,650

TELEPHONE CALL TRANSMITTER Filed March 24, 1938 9 she ts-sheets FIG. 22

254 95 /N M? N TOR c. 0, RICHARD I Bil/Q fiac fll u AT TORNE V Patented Aug. 26, 1941 UNITED STATES PATENT OFFICE TELEPHONE Charles D. Richard. West New Brighton, N; Y., as-

signor to Bell Telephone laboratories, Incorporated, New York, N.- Y., a corporation of New York '28 Claims.

This invention relates to call transmitters, and more particularly to call transmitters used in l automatic telephone exchange systems.

Its object is to provide an improved call transmitter of the key operated type which embodies a minimum number of simple operating parts and in which the call designations are indicated by registering dials appearing on the front of the casing housing the transmitter mechanism.

A feature of the invention resides in the provision of indices bearing key numbers operable for moving normally ineffective contact actuating elements in position effective relative to associated pulsing contacts-for setting a call.

Another feature is the provision of a lever mechanism interposed between the key members and the contact actuating elements for operating such elements in groups corresponding to the indices respresented by their actuating key members.

Another feature is the provision of a step-bystep operable mechanism actuated by the key members for successively positioning the contact actuating elements in operable relation with their actuating lever mechanism.

Another feature is the provision of means operating automatically upon the return movement of each key member to normal-for engaging the support of the contact actuating elements for centering such'elements relative to their actuating lever mechanism.

Another feature is the provision of manually operable means whereby the transmitter mechanism may be conditioned for transmitting a call designation either after the complete setting operation of the key members or bythe key-bykey setting operation of these key members.

Another feature is the provision of means operable automatically for controlling the extent of operation of the contact support under the action of the motor mechanism.

Another feature is the provision of means automatically operable for resetting the contact actuating elements to normal position at the conclusion of each call transmitting operation.

Another feature is the provision of registering means for indicating thecall designations set by the operation of the key members, such designations appearing through an opening in the front of the casing housing the transmitter mechanism.

Another feature is the provision of a gearing mechanism for actuating the registering wheels or dials, such gearing mechanism being con-' I trolled by the operation of a clutch in cooperation with stopping arms formed with the elements of the lever-mechanism.-

Another feature is the provision of manually operable means whereby the contact-actuating elements and the registering dials are returned to normal position for canceling a wrong telephone call designation prior to the pulsing operation of the transmitter mechanism.

Another feature is a pair or conductors extending through the movable pulsing contact support for electrically connecting the pulsing contacts to stationary terminals mounted on the frame of the transmitter mechanism.

Another feature is the provision of manually operating means whereby the registering dials are returned to normal position simultaneously with the tensioning of a motor spring.

Another feature is the provision 01' means operable for connecting the registering wheels to their driving shaft according to the ordinal operation of the key members in the setting of a call.

Anotherfeature is the provision of means controlled by the movement of the caming elements actuating mechanism for locking the key members at the completion of a call setting operation, means being provided for releasing these key members upon the operation of the motor spring tensioning mechanism and preparatory to a subsequent call setting operation.

Another feature is the provisionofmeans for protecting the contact actuating elements and associated contacts from dust.

Other novel'features and advantages of the invention will appear by the following description and by the claims appended thereto, reference being had to the accompanying drawings in which:

i Fig. 1 is a front elevation view showingthe registering dials in the operated position and the telephone handset in position on a cradle formed with the casing housing the transmitter mechanism; 7

Fig. 2 is a left-side elevation showing the transmitter conditioning mechanism in position for operation by the preset operations of the-key members;

Fig. 3 is a right-side elevation showing the casing with portions cut away and a number of operating parts in section;

Fig. 4 is a top view shown with the casing and a number of operating parts in section;

Fig. 5 is a vertical sectional view taken on line 5 5 of Fig. 4;

Fig. 6 is a horizontal sectional view taken on line 68 of Fig. 3; V

- tion;

Fig. 7 is a vertical sectional view taken .on line 1--l of Fig. 4;.

Fig. 8 is a horizontal sectional view taken on line 8-8 of Fig. 3;

Fig. 9 is a front assembly view shown with the casing and a number of operating parts in section;

Fig. 10 is a horizontal sectional view taken on line Ill-l0 of Fig. 3;

Fig. 11 is a rear assembly view shown with the casing in section; i

Fig. 12 is a partial view showing the operative relation of the system of levers and their actu ating digit key members;

Fig. 13 is a partial view showing one of the spring discs serving as bearing for mounting the registering wheels, the driving shaft for these wheels being shown in section;

Fig. 14 is a partial view of the mounting for the contact operating elements taken on line l4-l4 of Fig.4;

Fig. 15 is a partial view showing the drive for the registering wheels and the mechanism for conditioning the transmitter for preset and keyby-key pulsing operation, the conditioning mechanism being shown in position for present operation;

Fig. 16 is a detail view showing the driving mechanism for the support of the contact actuating elements and the key locking mechanism;

Fig. 17 is a view of the register mechanism enlarged, a number of operating parts being in section;

Fig.17A shows examples of indices carried by the registering wheels; f

Fig. 18 is a sectional view taken on line l8-l8 of Fig. 1'7, showing one of the wheels operatively connected to its driving shaft;

Fig. 18A is a view similarto that of Fig. 18 but showing the wheel disconnetedirom its driving shaft;

Fig. 19 is a modification of the clutch mechanism for controlling the operation of the registering wheels; I

Fig. 20 is a modification of the registering wheels resetting mechanism for use in connection with the key-by-key conditioning mechanism when transmitting calls consisting of a number' of digits less than the capacity of" its transmitter;

Fig. 21 is a side assembly view of the transmitter of the invention modified, showing the casing with portions cut away and a number 0 operating parts in section;

. Fig. 22 is a top view thereof shown with the casing in section;

Fig. 23 is a diagrammatical view showing the pulsing contact actuating elements set in position for transmitting the call designation HP3,7069, as indicated in Fig. 1;

Fig. 24 is a partial view of Fig. 23 shown with spaced relation to each other by bushings [6, ll,

I8, I9. 20, 2| and 22, these bushings serving as guides for a. similar number of independently moving clutch elements in the form of pins [6a, Ila, l8a, 20a, 2|a. and 22a, provided for a purpose which will be hereinafter described in detail. The disc [5 of drum D, as shown in Figs. 5,

'7, 10 and 11, is formed with a hub or sleeve 23,

on the lower end of which is secured a miter gear 24, resting on an end thrust bearing 25. The gear 24 meshes with a similar gear 26 secured on one end of a shaft 21 journaled in the bearing portions of a U-shaped support 28 secured to the base III by a plurality of screws 29, and on the other end of shaft 21 is securely mounted a ratchet wheel 30, best seen in Figs. 8, 10, 11 and 16, having in the present construction seven equally disposed peripherally disposed teeth. This ratchet wheel is operatively engaged by a spring-pressed pawl 3| mounted on the free end of a lever 32, in turn pivoted on a shoulder screw 33, threadedly engaging an upright extending lug 34 formed with the base III, while the other end of shoulder screw 33 is supported by a flange X, also secured to the base It) by a number of screws 35. A link 44, best seen in Figs. 3 and 16, operatively connects the lever 32 to a cross-bar 36 having its arms Y and Yi pivoted on a shaft 31 in turn Journaled at one end in the flange X and its other end in a. flange XI, also secured in the base ID by a number of screws 38.

The bar 36 is yieldably held against the under side of a plurality of. key members Kl, K2, K3, K4, K5, K6, K1, K8, K9 and KIO by a retractile spring ASR. These key members are pivotally mounted on shaft 31 and held individually in their normal non-operated position against a stop-bar 42, shown in Figs. 5, 7, 9 and 10, by retractile springs, such as 39, having their upper disposed ends hooked onto respective stud, as 40, carried by a bar 4| secured at both ends to the flanges X and XI, as by screws I3, while the lower disposed ends of these springs are hooked to their respective key Kl, K2, K3, etc., the angular movement of these key members being limited by the top bar 42 which is secured at the top end of a slotted upright extending plate 43 and in their operated position by stops afforded by the plate 43 at the bottom of slots SL,

' best seen in Fig. 9, which also serve for guiding the motor actuated clutch elements in the op- 1 era-ted position;

Fig. 25 is a partial view of Fig. 23 showing the contact actuating elements moved in their normal position after the call transmitting opera- Fig..26 is a diagrammatical view of a modification usedfor transmitting a call 'by shunting a predetermined number -of operations of the pulsing contacts as determined'by the contact actuating elements set bythe operation of the key members; and

Fig. 2'7 is another diagramma'tical view of the modification shown in Fig. 26.

shown in Figs. 3, 5, 7, 8, 10 and 16, upon its engagement with the notches N1, N2, N3, N4, N5, N6, and N1 of disc l5 as efl'ected under the tension of a spring 46 while a roller 41 carried by the cross-bar 36 engages the camming surface 48 of indeg; member 45 for disengaging it from .levers.

the notches NI, N2, N3, etc., as the case may be during the downward movement of each key Kl, K2, K3, etc., and thereby the downward pivotal movement of cross-bar 36.

The drum D,- as above mentioned, is provided with seven clutch elements I611, I111, l3a, etc., that is, one of such elements for each set of equally spaced contact acting or camming elements in the form of longitudinally movable pins Pl, P2, P3, P4, P5, P6, P1, P8, P9 and Pill, there being seven sets of such camming. elements disposed in equally spaced relation in a circular row and the distance between each set forming the so-called interdigit spaces provided for a purpose well-known in automatic telephone systems. These camming elements, as shown in Figs. 3, 4, 5, 7, 8, 21 and 22, pass through a felt ring FR best seen in Fig. '7 clamped between the spring rings 49 and 49a provided for frictionally holding 4 these camming elements either in their normal or operated position, the clutch elements being frictionally held in their operated and non-operated position by springs :r, :1: shown in Fig. 7 disposed in slots in the bushings I6, l1, l8, etc., and in contact with the clutch pins I6a, Ila, I811; etc. a

The key'members K1, K2, K3, etc., are disposed in engageable relation with lever members Ll, L2, L3, L4, L5, L6, L1, L3, L9 and Llil, respectively, these levers being inturn disposed in operative relation with the camming elements Pl, P2, P3, P4, etc., respectively, for moving them longitudinally upon the successive operation of the keys KI, K2, K3, etc., in position for engaging a movable spring 68 which with stationary conductor 61 form the pulsing contact.

' members KI, K2, K3, etc., for actuating a cor-.

Levers Ll, L2, L3, etc., are pivotally mounted on a shaft supported by flanges X and XI and are guided at their upper ends by a comb-shaped plate SP, shown in Figs. 4, 5, 6, '7, 11, and are yieldably held in the operated position by springs GS engaging .the pins GSI carried lby these Levers LI, L2, L3, etc., are formed with cross-bars Bi, B2, B3, B4, B5, B6, B1, B3 and B9 of different length for actuating these levers and the camming elements PI, P2, P3, etc., in the following numeric order:

Key KI operates lever Ll for moving camming element Pi.

Key K2 operates levers Li and L2 through bar Bl for moving the cammingelements Pi and P2.

Key K3 operates levers Li, L2 and L3 through bar B2 for moving the camming elements Pl, P2 and P3.

Key K4 operates levers Ll, L2, L3 and L4 through bar B3 for moving the camming elements PI, P2, P3 and P4.

. Key K5 operates levers Ll, L2, L3, L4 and L5 through bar B4 for moving the camming elements Pi, P2, P3, P4 and P5.

Key K6 operates levers LI, L2, L3, L4, L5 and L6 through bar B5 for moving the camming elementsPi, P2, P3, P4, P5 and P6.

Key' K1 operates levers Ll, L2, L3, L4, L5, L6 and L1 through bar B6 for moving the camming elements Pl, P2, P3, P4, P5, P6 and P1.

Key K8 operates levers Ll, L2, L3, L4, L5, L6, L1 and L8 through bar-"B1 for moving the camming elements Pi, P2, P3,,P4, P5, P6, P1 and P8.

-Key K9 operates levers Ll, L2, L3, L4, L5, L6, L1, L8 and L9'through the bar B8 for moving the camming elements Pl, P2, P3, P4, P5, P6, P1, P8 and P9.

Key Kill operates the levers Ll, L2, L3, L4, L5, L6, L1, L8, L9 and LI!) through bar B9 for moved on the sleeve 23 of drum D. This disc is provided at its peripheral edge with holes for receiving the camming element PI, P2, P3, etc., of each set for returning them to normal non-operated position upon the downward movement of disc 5| against the tension of a retractile coiled spring 64, best seen in Fig. 7 in a manner which will behereinafter described in detail.

0n shaft 50, as shown in Figs. 3, 5, '7, 10, 11 and 12, is pivotally mounted a yoke 51, normally resting on the horizontally disposed arms of levers Ll, L2, L3, etc., and to this yoke is secured, as by welding, .a cross-bar or extension provided for individually operating the clutch elements lGa, Ila, l8a; etc., upon the successive movement of drum D under control of any one of the key responding number of lever members LI, L2, L3, etc., while a projection 59, formed with the arm Yl of bar 36-, engages a lug 68, formed with the yoke 51 for-resetting the levers LI,.L2, L3, L4, etc., collectively upon 'the return movement of the key members KI, K2, K3, etc., tonormal.

0n the top disposed end of spindle I2 is loosely mounted a hollow shaft 60, best seen in Fig. '7,

journaled at its upper disposed end in a bearing portion, formed with an oblong-shaped spacer plate 6 I, secured to flanges X and XI by a number of screws 62, shown in Figs. 3, 4 and 21, and on the lower end of this shaft is mounted an arm 63, Figs. 7, 8, of insulating material secured to the shaft 66 by a pin 64 passing through a hardened steel plug 65, servingin cooperation with a steel ball 66 to form an end thrust bearing for the hollow shaft 60. In insulating arm 63 is embedded the stationary contact 61 which protrudes at right angles therefrom in engaged relation with the movable spring contact 68, also embedded in arm 63, these contacts having terminal ends protruding from the arm 63 for connection with the conducting wires 69 and 10,

passing through an insulating. bushing H and hence through the hollow shaft for connectionary terminals I4 and 15 mounted in a pileup arrangement on an upright support 16 formed with the spacer plate 6|, thus permitting the rotation of hollow shaft 60 while maintaining electrical connection between the contacts 61' and 68 of arms 63 and the terminals 14 and 75 on plate 6i, these springs also serving under certain operation of the transmitter mechanism for returning the shaft 60 to normal unoperated position. i

On shaft 60 is rotatably'mounted a seeve 11, best seen in Fig. '7, on the top end of which is secured a helical gear'lfl and at its lower disposed end is securely mounted a spur gear 19 provided with seven equally spaced bushingsa, 60b, 80c, 80d, 80c, 80f and 809, shown diagrammatically in Fig. 23, held collectively at their lower disposed ends by a ring 8|,these bushings serving as guides for a corresponding number of clutch elements in the form of pins 62a, 82b, 82c,

portion I08 formed with the spacer plate 8|.

support D, the clutching elements 80a, 80b, 800, etc., carried by gear 19 and the clutching elements I611, I 1a, I8a, etc., of drum D being provided for successively operatively engaging an opening 83 in the insulating arm 83 for actuating it either by the step-by step operation of the drumsupport D under control of key members KI, K2, K3, etc., or by the operation of a constant speed motor mechanism in a manner which will be hereinafter described in detail.

On flanges X and XI is journaled a shaft 84, shown in Figs. 4, 5, 7, 11 and 22, on one end of which is loosely mounted a handle lever 85 retained in position thereon by a screw CRW and on the other end of this shaft is mounted a coiled spring 88 having one of its ends hooked to a collar 81 keyed on the shaft 84 and its other end to the supporting flange XI. The movement of lever 85. is imparted to shaft 84 through a bushing or sleeve 92, best seen in Fig. 4, having two diametrically opposite lug portions 95 engaging segmental portions in the hub of handle lever 85 and on bushing 92 is mounted a gear sector 9|, the bushing92 and the gear sector 9I being keyed collectively on the'shaft 84 by a taper pin 93 while the ,bushing 92 is provided with a groove 94 cooperating with a screw CO to serve as a stop for limiting the angular movement of handle lever 85 toward its normal and operated position.

The movement of shaft 84 and that of gear sector 9| carried thereby is effective to rotate a pinion 98, shown in Figs. 3, 4, 9 and 17, and a gear 91 both secured on the hub of one-tooth ratchet wheel 98, in turn loosely mounted on a spindle 99, best seen in Fig. 17, screwed in a boss portion I formed with the flange X. The movement of gear 91 is imparted to a gear MI and to a seven-tooth ratchet wheel I02 through a springpressed pawl I03. Ratchet wheel I02 is keyed on one end of a. shaft I05, havingone of its ends journaled in flange X'and its other end in a lug 0n the end of shaft I05, adjacent the lug portion I08, is securely mounted a helical gear I01 meshing with its associated helical gear 18 at the end of hollow shaft 80 which is thus rotated upon the return movement of gear sector 9| toward normal under the tension of motor spring 88 but under control of a speed governor SPGv actuated by a vertically disposed shaft II2 operatively connected to gear 19 by a pinion 89.

order of 1 to while the pin I30 carried by the disc I28 is provided for controlling the operation of the so-called off-normal springs 0F, provided for a purpose well-known in automatic telephone systems.

On shaft 84 is keyed an arm "I, shown in Figs. 4, 7, 11 and 22 disposed in engageable-relation with a forked lever I32, engaging a collar I33 at the upper disposed end of a sleeve I84, best seen in Figs. 5 and '1, slidably mounted on sleeve 11, and at the lower end of sleeve I84 is secured a disc I85 having openings for engaging the clutching elements 82a, 82b, 82c, 82d, 82c, 82! and 82g for moving them downwardly collectively against the tension of a retractile spring I88 upon the movement of shaft 84, as effected by the manual operation of handle lever 85 as for tensioning the motor spring 88 thus operatively connecting the pulsing contact supporting arm 88 to the motor mechanism. The lever I82 is formed with a semi-disc bearing portion I48, shown in Figs. 4, 5, 11, 21 and 22, provided for mounting a spring-pressed pawl I44 disposed in engageable relation with the upright extending arm I45 of an angle lever having its horizontally disposed arm I48 engaging the collar 52 of disc 5| for resetting the camming elements PI, P2, P8, etc., in a manner which will be hereinafter describedin detail.

An angle-shaped lever I81, shown in Figs. 3, 4, 5 and'l, is pivoted as at I88 on lugs I39, formed with the spacer plate 8|. This angle lever has its downwardly extending arm disposed for en gaging a roller I under the tension of a spring I42; this roller is carried by arm I82 and serves when engaged by arm I81 for holding the arm The turning movement of hollow shaft 80 under the tension of motor spring 88 is normally prevented by a stop pin I09, shown in Figs. 4 and '1, engaging the tooth portion IIO of adisc I II carried by the vertically disposed shaft II2 which is journaled in bearings H3 and H4 extending from the flange XI. I

The stop pin I09 is carried by sector-shaped plate II5 secured on the top disposed end of vertically disposed shaft I20, journaled in lug portions LPI and LP2, extending from flange XI, and on the other end of this shaft is secured a fork-shaped arm II8. This arm is disposed in operative relation with a pin I I9 carried by a disc I23, shown in Figs. 3, 4, 5, '1, 9 and 11 securely mounted on the hub of a gear I24. This gear is loosely mounted on the top disposed end of hollow shaft 60 and is rotated through the movement of this shaft by a gear reduction train including the gear I25 keyed on the shaft 80, the duplex gear unit I28-I21 loosely mounted on a spindle I29 and the gear I24 engaging the gear I21, the ratio of this gear train being of the I32 and the clutch elements 82a, 8211, etc., actuated thereby in their lowered position when another roller I4Ia, carried. by the horizontal arm -of this angle lever rests against the underside of disc I28 for operation by a cam I4I upon the rotation of this disc as imparted by the movement of shaft for disengaging the arm I31 from roller I40 so as to permit the return movement of this arm to normal, as effected by the tension of spring I38 for returning the disc I35 and the clutch elements 82a, 82b, etc., to normal. As above mentioned, the disc portion I43 of lever I82 carries a pawl I44 provided for engaging the upright extending arm I45 of the angle lever pivoted on shaft 50 and due to the'other arm of this leverengaging the collar 52 of disc 5| a downward movement is imparted to this disc for moving the clutching elements I8a, I1a, [8a, etc., and the camming elementsPI, P2, P3, etc., to normal position at the conclusion of each pulsing operation under the tension of retractile spring I38 acting on disc I 85 when the downwardly extending arm of angle lever I31 is disengaged from roller I40 upon the engagement of cam I4Ia with roller I carried by the horizontally disposed arm of angle lever I81.

Upon theoperation of each key member KI, K2, K3, etc., and that of cross-bar 88 for oper ating the lever 32 and thereby moving the drum D step by step through the engagement of pawl 3I with the seven-tooth ratchet wheel 30, the pawl 3| also engages an eight-tooth ratchet wheel I41, shown in Figs. 6, 8, 10 and 16, for rotating a disc I48, this disc and its driving ratchet wheel I41 being loosely mounted on the shaft 21 and a pin I392: carried by the disc cooperates with a stop I50 formed with the upright support 28 for holding the disc in the start position, as

shown in Fig. 3, against the tension of a spiral retractile spring II. A lever I62 pivoted on the base I6 has 9. lug portion I63 for engaging under the tension of the spring I54 a notch I 46 at the periphery of disc 8 when the latter has been rotated seven-eighths of a turn simultaneously with the operation of the drum driving ratchet wheel 36, thus permitting this lever to move under a'lug I55 carried by the arm Y of cross-bar 36 for preventing further operation of the key members KI, K2, K3, etc., at the conclusion of a seven-digit call setting operation.

The return of disc I48 and arm I62 to normal and the consequent release of bar 38 for the freeing of the key members Kl, K2, K3, etc., is effected upon the operation of handle 85 as for tensioning the motor spring 86 through a link I56 connecting the gear sector 9| to a retaining pawl I51, this retaining pawl being formed with an arm I58 connected to the lever I52 by a link I59 best seen ill Figs. 3 and 16 for disengaging the leverfli 52 from disc I41 simultaneously with the release of ratchet wheel I41 by the retaining pawl i 51, thus permitting the disc to return to normal against the stop I56 under the tension of spiral spring I5I. I

As shown in Figs. 3, 6,11 and 16, the arm Y of cross-bar 36 is formed with another arm I63 having at its free end a clutch element in the form of a ratchet tooth I64 which is operatively engaged by a spring I 65 carried by a gear sector I66 loosely mounted on shaft 31 in position adjacent to the arm I63 and a screw I61 is provided for adjusting the tension of this spring and thereby the torque transmitte'dbythe gear sector I66. Gear sector I66 meshes with a pinion I68 securely mounted on the hub portion of a gear I69 in turn loosely mounted on a spindle I16 laterally extending from flange X. The gear I69 meshes with a pinion I1Ikeyed on the'shaft I12, journaled at one end in the flange X and its other end in a bushing I13, shown in Fig. 6, secured tothe flange XI. Shaft I16 carries a plurality of discs DI, D2, D3, D4, D5, D6, D1,

D8, D9 and DI6, each having a periphery disposed ratchet-shaped tooth angularly disposed one-eleventh of a circle apart for controlling the angular movement of shaft I12 through their engagement with their associated arms or levers.

LI, L2, L3, L4, etc., to cause the disengagement of clutch spring I65 from the ratchet tooth I64 of arm I63, as will be hereinafter described in detail. 0n the other end of shaft I12, as shown in Figs. 4, 6, 9, 11, 15 and 1'1, is securely mount-- ed a gear I14, the movement of which imparted to a gear I16 through a duplex gear sector I15 pivoted on flange XI. Gear I16 is keyed on the end portion of a driving shaft provided for actuating' the registering wheels RI, R2, R3, R4, l R5, R6, R1, R8, R9 and RN, in a manner which will be hereinafter described in detail. This shaft is formed of two reduced portions SPI. and SP2, best seen in Fig. 17, each having'a disc portion welded to the ends of a tubing portion I11, the reduced end SP2 is mounted for rotating movement in the bearing portion formed in the end of the spind1e 99, while the end SPI of this shaft is mounted for rotating movement in the bearing portion I18 formed with the flange'XI, while the tubing portion I11 is provided with a longitudinally disposed ratchet tooth 264 for engagement with pawls as 262 carried by the registering wheels RI, R2, R3, etc., the wheels RI and R2,

as shown in Figs. 1, 4, 9, 17 and 170 being print- 75 JKLMNO, PR8, 'rov, m and 4 Z operator R6 and R1 are printed with the ten arable numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0, plus a blank space, the 6 meaning 16, as is well known in I automatic telephone systems,

The register wheels RI, R2, R3, etc., are mounted on the hub portions of thin metal'discs I86, Ill, I62, I83, 184,185, I86 and I81 loosely mounted on the tubular portion I11. These discs are each provided with a peripherally disposed notch, as I88, snugly engaging a bar I89 which is formed with arms I96 and I9I pivoted on the hub I18 of flange XI and on the free end of spindle 99. Discs I86, I8I, I82, etc., are cash provided with spring elements 266, Ml, best seen inFig. 13, for

frictionally engaging the disc portions of the I registering wheels RI, R2, R3, etc., for prevention of the so-called overrun of these wheels when moved in registering position by the operation of key members KI, K2, K3, etc. Each registering wheel RI, R2, R3, etc., as above mentioned, is provided with a pawl 262 frictionally held in operated and non-operated position by a spring 263, shown in Figs. 18 and 18A and are successively moved in engaged relation with the longitudinally disposed ratchet-shaped tooth 264 in the tubular portion I11 by a plurality of cams 265, 266,

261, 268, 269, 2I6 and 2H disposed one-tenth of a circumference apart on a rotatable sleeve 2I2.

This sleeve is loosely mounted on a shaft 2I3a: journaled at one end in flange XI and its other end in an upwardly extending lug 214 formed with the angle-shaped bar 4| to which the retractile springs 39 of keys KI, K2, K3, etc., are hooked. The sleeve 2i 2 is provided at oneend with a clutch element 2 I6 engaged by an operable clutch element 2i 1 under the tension of a spring 2I8. Clutch element 2I1 is formed with a gear 2I9, shown in Figs. 5, 6, 9 andl'l, meshing with a gear sector 2I9a connected to the bar 36 by a link 226 for rotating the sleeve 2I2 and the cams 265, 266, 261, etc., carried thereby one-tenth of a turn upon each operation of the key members. KI, K2, K3, etc.

' 22I and thereby the movement of the bar I89 being effected by a pawl 224 carried by disc 223 and engagingaone-tooth ratchet wheel 96 formed with the hub of gear 91, the bar I89 being rotated one turn during each operation of handle lever 85 and, therefore, that of the movement of gear sector 9i and that of gear 91 for returning the wheels RI, R2, R3, etc., to normal unoperated position, as will be hereinafter described in detail.

The wheels RI, R2, R3, etc., are each provided at their periphery with a radial lug LI, L2, L3, L4, L5, L6 and L1 disposed in alignment against the front edge of bar I 89 when the pawls 262 of these wheels register with the longitudinally disposed tooth 264 of shaft 'portion I11 and the blankspaces of wheels RI, R2, R3, etc., in turn appearing through the window W in the casing CY housing the transmitter mechanism. The

turning movement of bar I89 is imparted to. the

ed with groups of symbols I, ABC, our, GHI,

sleeve 2I2 and the cams 205, 208 and 201 carried thereby through the gear 228 securely mounted ,on the hub portion of arm I90 formed with the bar I88 and engaging a gear 221 securely mounted on shaft; 2I3x, the gear 221 carrying a springpressed pawl 228 engaging a one-tooth ratchet wheel 229 formed at the end of sleeve 2I2 for rotating it in directions to that'of its driving clutch element 2I1 and thereby returning the cams 205, 206, 201, etc., to normal simultaneously with the return movement to normal of wheels RI, R2, R3, etc., as effected by the movement of handle lever 85.

A rocking stop bar 230, shown in Figs. 3, 4, 5,"

7, 9, l5 and 1'1, is provided at its end portions with arms 23I and -232 pivoted as on shoulder screws 233 and 234.- The downward movement of this bar under the tension of a spring 235 is limited by a pin hand is normally held in nonengageable relation from the lugs LI, L2, L3,

' etc., through the bar I89 engaging a lug 231 formed with the arm 23I of'bar Figs. 3, 4 and 5.

The registering wheels RI, R2, R3, etc., and the cams 205, 206, 201, etc., carried by the sleeve 2I2 may be returned to normal unoperated position independently of the operation of handle lever 85 by the operation of an auxiliary key member I60, shown in Figs. 3, 4, 6, 8, 9, and 11. This key member is pivoted on the shoulder screw 33 and is held in normal unoperated position against a pin 300, extending from flange K under the tension of a retractile spring 30I, having one of its ends hooked to a lug 302 formed with the auxiliary key member I60 and its other end to a pin 303 carried by the flange X, while the downward movement of this key member is limited by a stop 304 afforded by'its guiding plate 43. Key member I80 is provided with a gear sector 305 meshing with a pinion 308, having a hub portion loosely mounted in a bearing formed with the flange X and on the hub of pinion 308 is mounted a also 301, the pinion 308 and the disc 301 being keyed to a spindle 308 by a pin 309, best seen in Figs. 9 and 17. The other end of spindle 308 is journaled in plate M and on it is loosely mounted a sleeve 3) formed with a gear 3H and a one-tooth ratchet wheel 3I2 which is operatively engaged by a spring-pressed pawl 3I3 carried by the disc 301. The gear 3 meshes with a similar gear 3 keyed on the end of shaft 2 I 39: for imparting movement to gear 221 secured on the other end of shaft 2I3a: and thereby to sleeve 2I2 through the engagement of pawl 228 with the one-tooth ratchet wheel 229 formed with the sleeve 2 I 2, the rotation of gear 221 imparting movement to gear 228 for rotating the bar I89 and thereby resetting the registering wheels RI, R2, R3, etc., to normal unoperated position, as above described in connection with the operation of handle lever 85.

Supposing now that it is desired to set a number of key members-for transmitting the tele- 230, as shown in lation with the movable contact 88, this condition being shown in Fig. 21. The operation of these levers, that is, LI, L2, L3 and L4 is effective to pivot the ypke 51 and the extension 55 carried thereby for moving the clutch element 220 in engaged relation with the hole 83 *of pulsing contact supporting arm 83 for operatively connecting this arm and its hollow supporting shaft to the drum-shaped support D.

The downward movement of key K4 also causes the pivotal movement of bar 38 and that of the arm I63 carried thereby. The movement of this arm is imparted to gear sector I86 through the engagement of the spring pawl I65, see Fig. 3, with the ratchet tooth I84 of arm I63 and thereby to the pinion and gear unit I88I89, the shaft I12 through the engagement of gear I88 with pinion I1I, but, due to the staggered relation of the discs DI, D2, D3, D4, D5, D8 and D1, the shaft I12 will be rotated to a point wherein the disc D5 engages the lever L5 when the spring pawl I85 is caused to flex out of engagement from its associated clutch element I84, thus formed as to permit the continued movement of arm I83. The movement of shaft I12 and the pinion I14 carried thereby is imparted to the duplex gear sector I15 and to pinion I18 for rotating the shaft I11. The movement of this shaft actuates the registering wheel RIv through the engagement of its pawl 202 with the ratchet tooth of shaft I11 to a position for indicating the symbol GHI, the digit represented by key member K4 and the first digit in the call designation HP3,7068 above mentioned.

The downward movement of this key is efiec-' The pivotal movement of bar 36, as imparted by the downward movement of key K4 is eflective to disengage the arm 45 from the notch NI of disc I5 and moves the lever 32 to cause the engagementof pawl 3| with the ratchet wheels 30 and I41 for rotating them collectively upon the return of this key to normal the space of one tooth each, the ratchet wheel 30 rotating the drum-shaped support one-seventh of a turn phone call designation HP3,'1068 as indicated in I Fig. 1, the key member K4 bearing the symbols GHI for moving another set of camming elements PI, P2, P3, etc., in operative relation with the set of levers LI, L2, L3, etc., while the operation of ratchet wheel I41 rotates the disc I48 oneeighth of a turn, the ratchet wheel I41 and the disc I48 carried thereby being held in each advance position against the tension of its retractile spring I5I by the retainingpawl I51.

Upon the return movement of key K4 and that 204 of the shaft while the tension of springs 20.

- mitter mechanism is'now ready for the operation of key Kl bearing the -symbolsthe second digit in the call designation 112933068 above referred to.

The operation of key K1 is efi'ective to set seven of the camming elements PI, P2, P3, etc., in position, eflective, relative to-pulsing contacts 61 and 68 and to move the register wheel R2 in position for indicating the symbols PBS in a cycle of operation as described in connection with the operation of key K4.

Upon the complete setting of a call designation as HP3,7068 by the operation of the key members K4, K1, K3, K1, K6, K6 and K8, diagrammatically shown in'Fig. 21, and the consequent turning movement of the contact supporting arm 63, due to the engagement of clutching element 220 with this supporting arm as eifected by the operation of the first key member in the telephone call designation. HP3,7068, the operable pulsing contact 68 is angularly positioned for successively engaging the camming elements PI, P2, P3, etc., of each set which have been moved in operative relation by the operation of the key members K4, K5, K3, K1, K0,

.K6 and K8 upon the return movement of arm 63 and its supporting hollow shaft 60 to normal, as effected by the motor spring 86 following the operation of handle lever 85.

The operation of forked lever II6 upon the movement of the first 'key member in the designation above mentioned is effective to release shaft II2, actuating the speed governor SPG,

shown in Figs..4 and 7 but the transmitter mechanism under preset condition is not operated during the progression of the setting of the call due to the handle lever 85 being in its normal unoperated position, as determined by the screw CO engaging the groove 84 in sleeve 92.

Upon the downward movement of handle lever 85, the turning movement of its supporting shaft 84 is effective to tension the motorspring 86 and move the lever I32, best seen in Figs. and 7, through its engagement with arm I3I keyed on shaft 84 in position wherein the free end of arm. I31 engages the roller I46 under the tension of spring I42 for holdingthis lever and the disc I35 together with the clutching elements 62a, 821), etc., in the operated position, as shown in Figs. 24 and 2 5, wherein the clutching elements 82a, 82b, 82c, etc., under the tension of their respective springs SPI, SP2, SP3, SP4, SP6, SP1, move the clutching elements I6a, IIa, 68a, etc., in the non-operated position, with the clutching element 820, as in this example, now engaging the contact supporting arm 63. Under this condition, the release of handle lever 85 permits the motor spring to unwind for actuating the gear sector SI. This sector.actuates the gears 963I, the gear III! and thereby the ratchet wheel I62 secured on shaft I05 and the helical gears I01 and I8, thus rotating the contact supporting arm 63 and its tubular support 60 for successively moving the contact 68 in engageable relation with the camming elements PI, P2, P3, etc., of each set. 'At the conclusion of the call transmitting operation, the contact spring 66 is in the position shown in Fig. where the cam I carried by disc I23 causes the pivotal movement of angle lever I31 for disengag- I ing it from roller I4Il so that upon the release of lever I32 the coiled retractile spring I36 causes the movement of disc I for collectively returning the clutching pins 82a, 82b, 820, etc., collectively to normal unoperated position and causes the pivotal movement of angle lever I45, and thereby the downward movement of disc 5| through the engagement of the upright extending arm of this lever with pawl I44, the movement of this disc being effective to reset the camming elements PI, P2, P3, etc., to' normal position as indicated in Fig. 25 and the mechanism is now ready for a subsequent call setting and transmitting operation. It is to be noted that the register wheels RI, R2, R3, etc.,.have

' been returned to normal unoperated position upon the tension of the motor spring 86 by the movement of handle lever 85 and thereby that of gear sector 9| connected thereto.

Supposing now that an error is made in the setting of a call-designation" and that it is desired to cancel such a call either at the conclusion or'atany point during the progression of such a .call setting operation. The downward movement of auxiliary key member I66 and the gear sector 365' carried by this key is effective to impart a complete turn to pinion 366, best seen in Figs. 3 and 17, for rotating the gears 3H and 3I4 through pawl 3I3 engaging the onetooth ratchet wheel 3I2, thus actuating the shaft 2I3a: and thereby the gears 22'! and 226, the latter actuating the resetting bar I89. The auxiliary key I66, as shown in Fig. 3, through its lug 253 also actuates the arms 254 formed with arms I45I46 for moving the disc 5| and thereby reauxiliary key by the operator while the spiral springs 12 and 13 return the hollow shaft 66 and the contact supporting arm 63 in normal position and the mechanism is now ready for the setting of the telephone call designation desired.

The 'call transmitter device of the invention has been described for use for transmitting and registering telephone call designations by the preset operation of the key membersKI, K2, K3, etc.; a mechanism, however, is provided whereby the device may be readily conditioned for transmitting such call designations by the so-called keyby-key operation. This conditioning mechanism, as shown in Figs. 3, 4, 5, 7, 11 and 15, consists of a handle lever member 260 loosely mounted on the end of shaft 84 and retained thereon by a screw 26l. This lever, as best seen in Fig.- 11, is keyed to'the hub portion 262 of a lever 263 also loosely mounted on shaft 84 and passing through an opening in an indicator dial 264, the

lever 263 and the indicating dial 264 being held in either of two positions by a spring -365, shown in Fig. 15, engaging as the case may be the notches NI and N2 in disc 262, these positions corresponding to the inscription preset and key-bykey printed on the dial 264 appearing through a window 265 in the casing CY housing the trans- Lever 263 is operatively connected at the free end of anarm 266 by a. link 261, while arm 266 in turn is secured to one end of a sleeve 268, best seen in Fig. 6, loosely mounted on the bearing or bushing I13 of shaft I12, extending from flange XI and on the other end of sleeve 288 is securely mounted another arm- 283 for connection by a spring 210 to the top end of an arm 21I loosely mounted on pivot I38 adjacent to thearm I31. The other end of arm 268, like the arm 2", extends downwardly for engagement with roller I40 of forked lever member I32 when this lever is operated as above described, that is, for moving the disc I35 and the clutch elements 82a. 82b, etc., in the operated position for engaging the contact supporting arm 63.

Lever 263, best seen in Fig. 6, is provided with a projection 212 disposed in engageable relation with a plate 213 formed with two lugs or bearing portions as 214, shown in Figs. 6, '7 and 11, for pivoting this plate on a stud 215, this stud having one end supported by flange XI and its other end in a lug portion formed with the bar SP serving, as above described, for holding the levers LI, L2, L3, etc. in spaced relation to each other and a retractile spring 218 is provided for normally holding the plate 213 against the underside of projection 212 of lever '289 when this lever, and therefore the handle lever 260, is moved in the key-by-key position when the spring 266 engages the notch NI of disc 262, such positions being indicated by the dial 264. In that position a roller 211 shown in Fig. 7 carried by the plate 213 engages a cam 218 keyed on the vertically disposed shaft II2 which is rotated seven turns for each turn of gear 19. The movement of cam 218 is effective in cooperation with retractile spring 216 to impart reciprocating movement to the plate 2I3 for simultaneously actuating two of the clutching elements 82a, 82b, 82c, 82 etc. which may be in registry with the lugs H and HI of this plate.

In transmitting a call by the key-by-key operation of the pulsing mechanism the handle lever 85 as distinguished from the preset condition of the transmitter is first moved in its operated position for tensioning the motor spring 86, the movement of gear sector 9| and therefore the turning movement of shaft H2 and cam 218 carried thereby being now prevented. due to the engagement of a pin I09, best seen in Fig. 4, with the tooth IIO of disc III keyed on the vertically disposed shaft I I2. The downward movement of forked lever I32 as effected by the rotation of shaft84 during the tensioning of the motor spring is effective to move the clutch disc I35 and thereby the clutch elements 82a, 82b, 820, etc., in the operated position shown in Fig. 24, except two of these clutching elements, that is, 82a and 829, best seen in Figs. and 6, which are held from downward movement by their respective lugs HI and H formed as above mentioned with the segmental portion of plate 213 and engaging the retractile springs SPI and SP1 of these clutching elements. In that condition the contact supporting arm 63 may be moved angularly one-seventh of a turn when clutched with the drum-shaped support D without interference from the two clutching elements, the clutching element 82a being raised sufliciently high for permitting the projection 210 of arm 63 to pass under this clutching element. while the clutching element 82g is raised only to clear the upper disposed surface ofarm 63 and to engage the projection 219 for actuating this arm. The operation of any one of key members KI, K2, K3, etc. is effective during its downward movement to set, as above described, a corresponding number of camming elements PI, P2, 1P3, etc. and to move the clutching pins as I6a, I1a, Ila, etc. as the case may be for operatively connecting the contact supporting arm 63 with the drum D. The return movement of such operated key is eflective to rotate the drum support D and the contact supporting arm 63 oneseventh of a turn. The movement of shaft 60 which carries the contact supporting arm 63 and thereby the movement of disc I23 through the gears I25, I26, I21 and I24 is effective to impart a small angular movement to arm II6 due to its engagement with pin H9 for disengaging the pin I03 from the teeth IIO of disc III in order to permit the movement of shaft I I2 under the tension of motor spring 86 but controlled by the speed governor SPG.

The clutching pin I6a of drum D which was moved in engaged relation with contact arm 63 is upon the return movement of the operated key and the consequent angular movement of drum D in position formerly occupied by clutching pin 22a shown in Fig. 8 and in coaxial relation with clutching pin 82g of the motor actuated clutching pins now held in its elevated position by the lug H of plate 213 and against the tension of its own retractile spring SP1 with the tooth-shaped projection 219 of arm 63 in position to be engaged by the motor-driven clutching pins 829 above mentioned which occur upon a small angular movement of disc I35 of the motor-driven clu'tching elements the engagement of projection 213 of contact supporting arm 83 with clutching pin 82g being timed to occur simultaneously with the release of clutching ele ments 82a and 82g from the'projections H and HI of the segmental portion of plate 213 when the pin 82g engages the hole 83 of contact supporting arm 63 and simultaneously disengaging the arm, these projections having such an angular distance that from the clutch pin carried by the drum D thev engagement of pin 829 with V element in the group set by the operation of one of the key members KI, K2, K3, etc., and therefore within the angular distance determined by the interdigit spaces as to prevent the so-called shattering of the pulsing contacts. Upon a complete turn of cam 218 and thereby the return movement of the contact supporting arm 63 to normal, the pin 2I3 carried by disc I23 reengages the arm I60 for reengaging the pin I03 with the tooth of disc I I I for stopping the governor mechanism and the transmitter is now ready for the operation of thesecond key member included in the call designation it is desired to transmit which is accomplished in a. manner similar to that described in connection with the first operated key member, the handle lever 85 reaching its normal position upon the. operation of the last key member KI K2, K3, etc., in a sevendigit call designation and the complete call designation is indicated by the registering wheels RI, R2, R3, etc., at the conclusion of the call transmitting operation, these wheels being returned to normal upon the operation of handle lever 85 simultaneously with tensioning of motor spring 86 preparatory to the transmitting at a succeeding call designation.

In the modification shown in Figs. 26 and 27, the disc 8I of the motor-driven clutch is providedwith a continuous row of contact actuating elements 400 disposed in axial relation to the camming elements PI, P2, P3, etc., carried by drum D and stationary pulsing contacts 40I,'

402 are operatively'associated-with the contact actuating elements 400 which in this modification are the pulsing contacts, while the contacts 61 and 68 are used for negatlving the operation of the contacts 40I and 402 a number of times corresponding to the number 'of' camming elements set by the operation of the key members KI, K2, K3, etc.

simultaneously with the movement of contact As shown in Fig. 26, for example, the movement of camming elements 400 springs 61 and 68 over the contact elements PI,

P2, P3, and P4, the contacts MI, 402 and 61-66 will be opened four times simultaneously for transmitting the digit 4 corresponding to symbol GH I and while the pulsing contacts MI, 402 are actuated during the movement of contacts 6168 a number of times corresponding to the angular distance included between the camming element P4 of symbol I and camming element PI of symbol PR S the operation of contact 40I, 402 will be negatived due to the contacts61-68 remaining closed, Similarly upon the passing of contact 61-66 on I the camming elements PI, P2, P3, P4, P5, P6 and P1 representing the symbol PR S the contacts 61-68 will again beoperated simultaneously with the opening of the contacts 40| and 402 by pins 400, thus transmitting seven pulses, this operation being repeated for each 506 engaging a stop 5, the levers LI, L2, L3, etc., being returned to normal position by the cross-bar 51, best seen in Fig. 8, when the projection 59 of arm YI formed with bar 36 engages the lug 58 upon the return movement of this bar to normal unoperated position. i

'In the modification, shown in Fig. on a shaft 52I, is securely mounted the operating arm 260, the dial 264 and the armv520. The arm 520 is connected to one end of lever 522 pivoted on the gear sector 9| and having its downward extending portion terminating in the form of a hook 524 engaging'a pin 525 carried by an auxiliary key member H6 so that the operation of auxiliary key member H6 prior to the operation of the device as for transmitting a call designation of less than seven digits is effective to move the gear sector 8| in its starting position while tensioning the motor spring 86 simultaneously with the resetting of the register wheels RI, R2,

' R3, etc., to normal through the rotation of pinwherein the registering mechanism is omitted.

In this modification, the camming elements are moved in engageable relation with'the contact 68 in the manner above described and the operation of handle lever 85 is effected at the conclusion of each call setting operation for turning the shaft 84. and thereby tensioning the motor spring 86. The movement of shaft 84 is effective to impart a small angular movement to Y the arm I3I for actuating the lever I32 and movsector I66 through the engagement of pawl 504 I carried by this gear sector with the tooth 503 at the free end of lever I63. The operation of any one of these key members is also effective to move the levers LI, L2, L3, L4, etc., in number corresponding to the digits represented by these key members thus moving their pivoted arms 505 out of engagement from their associated 'toothed disc members DI, D2, D3, etc. as the case may be. The engagement of disc D4, for example, with its associated pivoted arm 504.12 is effective to impart a rotating movement to a bar 506 common to all levers LI, L2, L3, etc. having an upright extending arm 501 disposed in operable relation with lever 508. This lever is pivoted as at 509 andis formed with an arm 5! provided at its free end with an arcuated groove 5 engaged by a pin 5I2 carried by pawl 504 for moving this pawl out of engagement from the ratchet tooth 503 upon the movement of arm 504:1: as imparted bydisc D4. Upon the disengagement of pawl 504 from ratchet tooth 503 further angular movement of shaft I12 and the register wheel which may have been operated ing the clutch elements 82a, 82b, 820, etc., in the operated position for engaging one of them with the contact supporting arm 63 while disengaging it from one of the clutch elements carried by the drum D. Upon the pivotal movement of lever I32 the arm I31 engages the roller I40 for holding this arm and the clutching elements 82a, 82b, 820, etc. carried thereby in the operated position during the return movement of shaft 84 and that of the arm I3I to normal, the contact support 63 and the contact 68 carried thereby being operated through the return movement of gear sector 9| ,through the pinion 96, the gear 91 secured to this pinion and the gear IOI meshing with gear 31 for rotating the shaft I05 through the pawl I03 engaging the seven-toothratchet wheel I02 keyed on shaft I05,"thus rotating the angle gears I01. and 18, the latter being formed as above described at one end of sleeve 11 also carrying the gear 18.

At the conclusion of each pulsing operation the cam I4I engages the roller I4Ia for imparting a small angular movement to lever I31 for disengaging it from roller I40 and thereby freeing the arm I32 to permit its return movement and that of the clutching elements-82a, 82b, 820, etc., to normal while the contact supporting arm is'held in norm-a1 unoperated position against the tension of spiral springs 12 and 13 .due to the tooth. 550' of disc I 23 abutting against a lug 55I formed with I to indicate digit t is prevented due to the bar plate 6|.

The operation of auxiliary key member I60 as for canceling a wrong call designation prior to the pulsing operation of thetransmitter is effective to impart a pivotal movement to lever I46 through lug 253 carried by this auxiliary key member engaging the arm 254 formed with lever I46 for moving the disc 5| and thereby resetting the clutching pins I6a, I111, I841, etc., and the camming elements PI, Pi, P8, etc., to normal position simultaneously, the disc 5| being returned to normal unoperated position by its re- 21 is provided for preventing dust reaching the contacts 61 and 68. It is formed of two parts which are secured by screws 5|6 to lug portions 511 formed with an angle piece 518 secured to the underside of bar 44, the angle piece 618 being provided with a slot for receiving the free end of' arm 45 for assisting in the centering of drum D. The casing CY housing the transmitter mechanism is secured to the base l0 by a plurality of screws $4, shown in FigsQB, 5, '7 and 21. This casing carries a cradle CRA for receiving the handset HS and a plunger PL provides for actuating switch springs, not shown, ,for effecting well-known switching operations.

It is also understood that minor changes may be made to the invention without departing from the scope or the appended claims, the provision of a greater or lesser number of sets of cam elements Pl, P2, P3, etc., the use of other types of clutches for connectingthe drum D to the contact supporting arm and this arm to the motor, the substitution of an electric motor and its controlling mechanism for a motor spring and the arrangement of the cam elements for transmitting call designations by code are examples of such changes.

What is claimed is:

1. In a call transmitter, a pair of pulsing con- 4. In a call transmitter, a set of numbered key members, a plurality of levers actuated by the movement of said key members from normal, said levers being interconnected to each other to operationin number equal to the numeral or each of said key members, camming elements, a support for said elements actuated by the movement of said key members for successively positioning said elements in operative relation with said levers upon the return movement 01 said key members to normal for setting a call, a bar actuated by the operation of each of said key members, and means actuated by the suctacts, a plurality of longitudinally movable pins normally ineffective to operate said contacts disposed in a group, a set of key members operatively associated with said longitudinally movable pins for moving said pins in groups corresponding to said key members in position eil'ective with respect to said contacts, and means for imparting movement to said contacts and said actuating means relatively to cause the make and break operation of said contacts.

2. In a call transmitter, a pair of contacts, a plurality of normally ineffective independent actuating longitudinally movableelement for said contacts disposed in a group, a set of indices bearing key members, a system of levers actuatedby said key members for. moving said elements in groups of varying numbers in position effective relative to said contacts for setting a call, and pins for moving said contacts in engaged relation with each of said efiective elements for transmitting such a call.

- 3. In a call transmitter, a pair of contacts, a plurality of actuating means normally ineffective relative to said contacts, a set of indices bearing key members, interconnected levers actuated by said key members for moving said actuating means in numbers varying according to the operation of said key members in position effective relative to said contacts for setting a call, and means for moving said contacts in en-' gaged relation with said actuating means for transmitting such a call.

cessive operation of said bar for locking said key members against movement upon the completion of said call setting operation.

5. In a call transmitter, contacts, a set of digit key members, camming elements, means actuated by each of said key members in one direction for setting a group of said elements in number corresponding to the digit represented by the operated key member, a rotatable support for said camming elements actuated by the successive operation of each of said key members in the other direction for moving other groups of said elements in operative relation with said means, a rotatable support for said contacts, and means for actuating said supports relatively for engaging said contact with the groups of said operated elements for sending series of pulses corresponding to the operation of each of said key members.

6. In a call transmitter, a rotatable support,

a set of indices bearing key members for actuating said support, a plurality of levers interconnected to each other for operation according to the'indices represented by said key members, a plurality of contact actuating elements moved by the operation of said support in engageable relation with said levers for .setting a call, a pair of contacts, a rotatable support for said contacts, and motor means for actuating the second-mentioned rotatable support relative to the first-mentioned support for causing the make and break operation of said contacts upon their engagement with,the elements set by the operation of said levers.

7. In a call transmitter, a rotatable drumshaped support, a set of key members, a mechanism for actuating said support step by step upon the successive operation of said key members, pulsing contacts, a rotatable support for said contacts, a plurality of groups of movable digit defining elements carried by said drumshaped support, said elements being normally ineffective relative to said contacts, means actuated by the operation of said key members from normal for positioning the elements in each of said groups in number depending upon the digit value of said key members in position efiective relative to said contacts upon each step of said drum, means actuated by said key members for operatively connecting said rotatable support to said drum-shaped support, a motor spring, a manually operable lever member for tensioning said spring, and means actuated by said lever member for operatively connecting said rotatable support to said motor spring and simultaneously disengaging it from said drum-shaped support for actuating said rotatable support for en- .gaging said contacts ,with said effective elements.

for actuating said drum and said movable support one way, camming elements carried by said drum and set by the operation of said key members in position effective relative to said contacts and a constant speed motor mechanism for actuating said movable support the other way relative to said drum for engaging said contacts with the elements set by the operation of said key members.

'9. In a call transmitter, a set of pivoted key members, a rotatable drum-shaped support, groups of equal number of longitudinally slidable camming elements carried by said drum, a pair of contacts operatively associated withsaid elements, a rotatable support ior said contacts said elements being normally in position ineffective relative to said contacts, a lever for each of said camming elements in one of said groups disposed in operable relation with each of said key members, a pivoted bar actuated by the movement of each of said key members, a pawl actuated by the movement of said bar, a ratchet wheel actuatedv by said pawl for rotating said drum for successivelypositioning said slidable elements in engageable relation with said levers for setting a call, and motor means for moving said contacts in engaged relation with the elements set by the operation of said key members.

10. In a call transmitter, contacts, a rotatable drum-shaped support, a plurality of sets 01' contact actuating elements carriedby said drum, said elements being normally in position ineffective relative torsaid contacts, a movable support for said contacts, a set of numbered key members, a ratchet mechanism actuated by the operation of each of said key members for rotating said drum step by step, means actuated by the operation of the first of said key members in the setting of a call for operatively connecting said movable'support to said drum, a lever mechanism operated by each of said key members for moving said elements set by set upon the step by step operation of said drum in number corresponding to the numerical value of said operated keys in each of said sets in position eifective relative to said contacts, a constant speed motor mechanism, and means manually operable for disconnecting said support from said drum and simultaneously operatively connecting it to said motor for causing the successive make and break of said contacts according to the operation of said key members. I

11. In a pulsing device, a set ofikey members, normally ineffective camming elements, a oneway movable supporting member for said elements, a pair of contacts, a two-way movable support for said contacts, means actuated-by the movement of said key members from normal for setting said elements in position effective relative to said contacts, means actuated by said key members for operatively connecting said support to said supporting members for moving them collectively, said supporting member in said way and said movable support in one ated in varying numbers by the operation of each of saidkey members from normal for moving said elements according to said varying numbers in position eflective relative to said contacts and simultaneously operatively connecting said one-way movable support and said twoway movable support for moving them collectively upon the return movement of said key members to normal, a motor spring, a gearing mechanism actuated by said spring, ,and manually operable means tor tensioning said spring and disconnecting said two-way movable support from said one-way movable support and simu.l-' taneously operatively connecting said two-way movable support to said gearing mechanism for moving said contacts in engaged relation with said effective digit defining elements, a speed governor for controlling the operation of said gearing mechanism, and means operable automatically upon the movement of said two-way movable support for controlling the extent of operation of said motor.

of said two ways upon the return movement of said key members to normal, and motor means for actuating said movable support the other of said two ways for engaging said contacts with said effective elements.

12. In a call transmitter, a set of key members, normally ineffective digit defining elements, a one-way movable supporting member for said elements, contacts, a two-way movable support for said contacts, a setof levers actu- 13. In a call transmitter, a pair of contacts, a two-way movable support for said contacts, a plurality of camming elements normally in position ineffective relative to said contacts, a set of key members operable for moving said elements in position eifect'ive relative to said contacts, and means manually operable in two positions for conditioning the transmitter, in one position for transmitting a call by the successive back and forth movementof said support and in the other position for transmitting a call by a single back and forth operation of said support.

14. In a call transmitter, a rotatable drumshaped support, a plurality of digit defining elements carried by said drum-shaped support, a pair of contacts operatively associated with said elements, said elements being normally in posi-- tion ineffective relative to said contacts, a movable support for said contacts, a set of digit key members, means for actuating said drum-shaped support upon the operation of said key members,

means actuated by said key members for operatively connecting said movable support to said drum-shaped support, a lever mechanism actuated by each oi said key members for successively and collectively operating said elements in groups upon the movement of said drum in number corresponding to the digits of said key members for setting a call, and a register mechanism operable upon the operation of each of said key members and controlled by the operation of said lever mechanism for indicating the call des-' ignation set bythe operation of said key members, and motor means for moving said movable support relative to said drum-shaped support to cause the make and break operation of said contacts for transmitting the call set by the operation of said key members.

15. Ina call transmitter, a pair of contacts, a movable support for. said contacts, another movable support, camming elements carried by the last-mentioned support, a set of key members, means for operating the last-mentioned support upon the successive operation of said key members, a lever mechanism actuated by the operation .of said key members for opera- 

